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Re: Vacuum lines for 4 wheel drive
If you look under the Jeep on the passenger side of the front axle you will see a vacume mod its kind of round shaped it should have a vacume plug on it wit ha few hoses going into it make sure its plugged in for starters these come off all the time if it looks good here simply follow the lines into the engine compartment and look for broken hose this should get you a fix most of the time, the mod could be defective but not likely.
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I would first check the vacuum disconnect on the front axle (dana 30). The vacuum lines often become clogged and/or broken, especially when wheeling a 20 year old Jeep. My solution for my '93 YJ was the cable option which replaces the vacuum one (try Quadratec). This way I had a more positive feeling and no more vacuum issues to worry about.
Check the vacuum disconnect on the front axle. After 15 years, the lines break and/or get clogged. I have seen a few of the shift forks in there broken on Jeeps still wheeling with the stock Dana 30. There is a cable option which replaces the vacuum system if you dont want to worry about having the problem again. check Quadratec or 4WD hardware.
Probably becuse when selling the vehicle 4-wheel drive had a problem and the vacuum is what switches into 4-wheel mode.The lights would come on indicating 4x4 on.and without lifting vehicle off the ground you couldnt tell. An old trick of the trade. ?
remove the vacuum hose from the shift motor on the front axle.with the vehicle running,(be sure to set parking break and /or chock tires.) place your finger over the end of the hose check for vacuum,it will be very slight. if there is no suction it is probably the vacuum switch on the transfer case. if there is vacuum,first check the vacuum motor for holes.(they rust through sometimes.) if no holes are noticed, remove the shift motor and check the shift fork. if the 4wd indicator light comes on it is probably the shift fork.
The front axle connects 4wd by vacuum. check the vacuum hoses that run to the actuator. Pay close attention to the vacuum hoses running underneath the battery as battery acid can eat thru those hose easily. Good Luck.
Our Jeep Wrangler YJ's are equipped with a vacuum module on the front axle. It is used to engage the front axle when the transfercase is shifted into 4WD. Check the vacuum lines on the front axle to make sure they are connected. The passenger side axle shaft has a disconnect sleeve that is moved left and right by the vacuum.